Wickman, B. E. 1967. Tree classification and susceptibility to bark beetles. Unpublished manuscript presented at Bark Beetle Workshop, Denver, Colorado, 7-10 February 1967. United States Department of Agriculture, Forest Service. 8 p. (dittoed).
Wickman 1967
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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